Low-cost quenched and tempered 690MPa-grade steel plate for engineering machinery and production method

A technology of engineering machinery and production methods, which is applied in the field of steel production, can solve the problems of high energy consumption and long cycle, and achieve the effects of excellent welding performance, low carbon equivalent, and reduced production costs

Inactive Publication Date: 2018-03-06
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the off-line heat treatment steel plate has stable performance and good uniformity, the technical means are easy to implement, but the energy consumption is high and the cycle is long

Method used

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  • Low-cost quenched and tempered 690MPa-grade steel plate for engineering machinery and production method
  • Low-cost quenched and tempered 690MPa-grade steel plate for engineering machinery and production method
  • Low-cost quenched and tempered 690MPa-grade steel plate for engineering machinery and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The thickness of the steel plate is 60mm, the carbon equivalent Ceq=0.520, its chemical composition and mass percentage are: C 0.17%, Si0.38%, Mn 1.21%, P 0.016%, S 0.003%, Cr 0.29%, Mo 0.41 %, V 0.044%, Ti 0.015%, B 0.003%, the balance is Fe and unavoidable impurities.

[0025] The production method of this steel plate includes smelting, heating, rolling and heat treatment processes, each process process is as follows:

[0026] (1) Smelting process: molten steel is smelted in an electric furnace, refined in an LF furnace, deeply deoxidized and desulfurized, and the composition of the molten steel is adjusted according to the target requirements. When the temperature of the molten steel reaches 1623-1638°C, vacuum degassing treatment is carried out, and continuous casting is carried out to obtain a billet with a thickness of 300mm. .

[0027] (2) Heating process: the heating temperature of the billet is 1250°C.

[0028] (3) Rolling process: Two-stage controlled rollin...

Embodiment 2

[0033] The thickness of the steel plate is 35mm, the carbon equivalent Ceq=0.499, its chemical composition and mass percentage are: C 0.11%, Si0.40%, Mn 1.42%, P 0.017%, S 0.004%, Cr 0.23%, Mo 0.50 %, V 0.033%, Ti 0.021%, B 0.002%, and the balance is Fe and unavoidable impurities.

[0034] The production method of this steel plate includes smelting, heating and rolling processes, and the processes of each process are as follows:

[0035] (1) Smelting process: molten steel is smelted in an electric furnace, refined in an LF furnace, deeply deoxidized and desulfurized, and the composition of the molten steel is adjusted according to the target requirements. When the temperature of the molten steel reaches 1625-1637°C, vacuum degassing treatment is carried out, and continuous casting is carried out to obtain a billet with a thickness of 300mm. .

[0036] (2) Heating process: the heating temperature of the billet is 1220°C.

[0037] (3) Rolling process: Two-stage controlled roll...

Embodiment 3

[0042] The thickness of the steel plate is 10mm, the carbon equivalent Ceq=0.518, its chemical composition and mass percentage are: C 0.23%, Si0.45%, Mn 1.09%, P 0.018%, S 0.004%, Cr 0.22%, Mo 0.27% %, V 0.041%, Ti 0.017%, B 0.002%, the balance is Fe and unavoidable impurities.

[0043] The production method of this steel plate includes smelting, heating and rolling processes, and the processes of each process are as follows:

[0044] (1) Smelting process: molten steel is smelted in an electric furnace, refined in an LF furnace, deeply deoxidized and desulfurized, the composition of the molten steel is adjusted according to the target requirements, vacuum degassing treatment is carried out when the temperature of the molten steel reaches 1621-1635 °C, continuous casting, and a billet with a thickness of 200mm is obtained .

[0045] (2) Heating process: the heating temperature of the billet is 1240°C.

[0046](3) Rolling process: Two-stage controlled rolling process is adopte...

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Abstract

The invention relates to a low-cost quenched and tempered 690MPa-grade steel plate for engineering machinery and a production method, and belongs to the technical field of steel production. The steelplate comprises the following chemical components in percentage by mass: 0.10-0.25% of C, 0.20-0.60% of Si, 1.00-1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.007% of S, 0.20-0.50% of Cr, 0.20-0.50% of Mo, 0.03-0.06% of V, 0.01-0.03% of Ti, 0.001-0.003% of B, and the balance of Fe and inevitable impurities. The production method comprises the processes of smelting, heating, rolling and heat treatment, wherein the rolling process adopts a two-stage controlled rolling process, and the heat treatment process adopts a quenching and tempering process. The steel plate provided by the invention reduces the content of precious metals and has a low production cost; the steel plate has excellent mechanical properties by adopting a process of 'controlled rolling and off-linequenching and tempering heat treatment'.

Description

technical field [0001] The invention relates to a low-cost quenched and tempered 690MPa-grade steel plate for construction machinery and a production method, belonging to the technical field of steel production. Background technique [0002] Q690 steel plate has high yield strength and tensile strength, and is widely used in coal mining machinery and construction machinery, such as hydraulic supports, port cranes, etc. With the development of my country's construction machinery and equipment in the direction of large-scale and lightweight, higher requirements are put forward for the performance of the main load-bearing structural materials of the equipment, and the demand for Q690 grade steel for construction machinery is also increasing. [0003] Theoretically speaking, two processes of "controlled rolling + on-line heat treatment" and "controlled rolling + off-line quenching and tempering heat treatment" can be adopted to produce 690MPa grade steel plates for construction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/22C22C38/24C22C38/28C22C38/32C21D8/02C21D1/18
Inventor 陈振业孙力陈起赵燕青张朋钟金红梁爱国
Owner HEBEI IRON AND STEEL
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